<html>

<head>
    <title></title>
    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>

<body>
    <div id="todo-list-example">
        <input v-model="newTodoText" v-on:keyup.enter="addNewTodo" placeholder="Add a todo">
        <ul>
            <li is="todo-item" v-for="(todo, index) in todos" v-bind:key="todo.id" v-bind:title="todo.title" v-on:remove="todos.splice(index, 1)"></li>
        </ul>
    </div>

</body>
<script>
    Vue.component('todo-item', {
        template: '\
    <li>\
      {{ title }}\
      <button v-on:click="$emit(\'remove\')">X</button>\
    </li>\
  ',
        props: ['title']
    })

    new Vue({
        el: '#todo-list-example',
        data: {
            newTodoText: '',
            todos: [{
                    id: 1,
                    title: 'Do the dishes',
                },
                {
                    id: 2,
                    title: 'Take out the trash',
                },
                {
                    id: 3,
                    title: 'Mow the lawn'
                }
            ],
            nextTodoId: 4
        },
        methods: {
            addNewTodo: function () {
                this.todos.push({
                    id: this.nextTodoId++,
                    title: this.newTodoText
                })
                this.newTodoText = ''
            }
        }
    })
</script>

</html>